Salesforce Exam DEX-450 Topic 12 Question 43 Discussion

A developer uses a before insert trigger on the Lead object to fetch the Territory__c object, where the Territory__c.PostalCode__c matches the Lead.PostalCode. The code fails when the developer uses the Apex Data Loader to insert 10,000 Lead records. The developer has the following code block: Line-01: for (Lead l : Trigger.new){Line-02: if (l.PostalCode != null) {Line-03: List<Territory__c> terrList = [SELECT Id FROM Territory__c WHERE PostalCode__c = :l.PostalCode];Line-04: if(terrList.size() > 0) Line-05: l.Territory__c = terrList[0].Id; Line-06: }Line-07: }Which line of code is causing the code block to fail?